Korean Chemical Engineering Research

  • 제43권3호
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  • Pages.401-406
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  • 2005
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  • 0304-128X(pISSN)
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  • 2233-9558(eISSN)
한국화학공학회 (The Korean Institute of Chemical Engineers)
권호 표지

다중벽 탄소나노튜브강화 에폭시 매트릭스 복합재료의 열적 및 동적 점탄성 거동 연구

Studies on Thermal and Dynamic Viscoelastic Behaviors of Multiwalled Carbon Nanotubes-reinforced Epoxy Matrix Composites

  • 서민강 (한국화학연구원 화학소재연구부) ;
  • 박수진 (한국화학연구원 화학소재연구부)
  • Seo, Min-Kang (Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Park, Soo-Jin (Advanced Materials Division, Korea Research Institute of Chemical Technology)
  • 투고 : 2005.01.11
  • 심사 : 2005.03.10
  • 발행 : 2005.06.30
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초록

본 연구에서는 다중벽 탄소나노튜브의 화학적 표면처리가 에폭시 매트릭스 복합재료의 유리전이온도, 열안정성 그리고 동적 점탄성거동에 미치는 영향을 고찰하기 위하여 시차주사열량계(DSC), 열중량분석기(TGA) 그리고 동적 기계적 분석기(DMA)를 통하여 각각 측정하였다. 탄소나노튜브의 표면처리는 35 wt％의 $H_3PO_4$(A-MWNTs) 혹은 35 wt％ KOH(B-MWNTs) 용액으로 화학적 표면처리를 하였으며, 표면처리 후 표면특성 변화는 pH, 표면 산 및 염기도, 적외선 분광법(FT-IR)과 자외선 광전자 스펙트럼(XPS) 분석을 통하여 알아보았다. 그 결과로서, 산-염기 상호반응에 의한 각각의 표면처리는 탄소나노튜브의 표면특성 및 화학적 조성 변화를 가져오며, 산처리한 MWNTs/에폭시 복합재료의 경우가 염기처리 및 미처리 시편과 비교하여 열안정성 및 동적 점탄성 특성에 있어서 탄소나노튜브 표면에 도입된 산성 관능기 그룹의 영향으로 큰 값을 나타내었다. 이는 염기성을 가지는 에폭시 수지와 산성을 가지는 탄소나노튜브와의 산-염기 및 수소결합에 의한 계면결합력의 향상 때문이라 생각된다.

In this work, the effect of chemical treatment of multiwalled carbon nanotubes (MWNTs) on glass transition temperature (Tg), thermal stability, and dynamic viscoelastic behaviors of MWNTs-reinforced epoxy matrix composites has been studied by differencial scanning calorimeter (DSC), thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA) measurements. The MWNTs were chemically treated with 35 wt％ $H_3PO_4$ (A-MWNTs) or 35 wt％ KOH (B-MWNTs) solutions and the changes of surface properties of chemically treated MWNTs were examined by pH, acid and base values, Fourier transfer-infrared spectroscopy (FT-IR), and x-ray photoelectron spectroscopy (XPS) analyses. The chemical treatments based on acid and base reactions led to a significant change of surface characteristics and chemical compositions of the MWNTs, especially A-MWNTs/epoxy composites had higher thermal stability and dynamic viscoelastic properties than those of B-MWNTs and non-treated MWNTs/epoxy composites. These results were probably due to the improvement of interfacial bonding strength, resulting from the acid-base interaction and hydrogen bonding between the epoxy resins and the MWNT fillers.

키워드

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